Includes a pack of 100 Personna® heavy-duty (.017 thick) square edge slotted razor blades which are individually wrapped in paper. Square edge blades provide a sharp, precise point for starting a cut with the knife. They also cut to full depth when used in seam cutters such as the Crain No. 301 Cushion Back Cutter and No. 302 Cushion Back Cutter. These blades can be used in the following Crain tools: Nos. 217, 247, 290, 300, 304, 301, 302, 303, 330, 720, 735, 725, 726. The individually wrapped blades come in a laminated paper box. Blade dimensions: length: 2.25″, width: .75″, thickness: .017″.